On the single pet view pages [1] there is a block called "My Collection". It currently shows a check box for your ownership of the pet and a percentage of users who own the pet.

A useful addition to this would be a list of each copy of this pet that I own, with their levels, rarities, and breeds. A common use for this would be building theoretical pet battle teams and wanting to quickly see what versions of a pet I already have access to.

Hi just wanted to let you know you can find all that info and more at petsear.ch that site has more info then you'll need on your collection. Plus you can download your collection into an excel spread sheet and do all kinds of extra sorts as well. Great for putting together battle teams.